Craftsman 917.28990 Operator's Manual page 33

TROUBLESHOOTING CHART:
See appropriate section in manual unless directed to Sears service center
PROBLEM
Loss of power
Excessive vibration
Engine continues to
run when operator
leaves seat with atta-
chment clutch engaged
Poor cut - uneven
cutting
Mower blades will
not rotate
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CAUSE
Cutting too much grass/too fasL
Throttle in "CHOKE" position.
Build-up of grass, leaves and
trash under mower_
Dirbj air filter.,
Low oil level/dirty oil
Faulty spark plug.
Dirty fuel filter°
Stale or dirty fuel.
Water in fuel,
Spark plug wire Ioose_
Dirty engine air screen/fins.
Dirty/clogged muffler.
Loose or damaged wiring_
Carburetor out of adjustment.
Engine valves out of adjustmenL
Worn, bent or loose blade,
Bent blade mandrel,
Loose/damaged part(s).
Faulty operator-safety presence
control system.
Worn, bent or loose blade.
Mower deck not level°
Buildup of grass, leaves, and
trash under mower_
Bent blade mandrel.
Clogged mower deck vent from
build-up of grass, leaves, and
trash around mandrels°
Obstruction in clutch mechanism_
Worn/damaged mower drive belt
Frozen idler pulley°
Frozen blade mandrel.
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CORRECTION
Raise cutting height/reduce speed..
Adjust throttle control
Clean underside of mower
housing.
Clean/replace air fitter_
Check oil level/change oil
Clean & regaporchange spark plug.
Replace fuel filter.
Empty fuel tank and refill tank with
fresh, clean gasoline.
Empty fuel tank and carburetor,
refill tank with fresh gasoline and
replace fuel filter.
Connect & tighten spark plug wire,
Clean engine air screen/fins.
Clean/replace muffler°
Check all wiring.
See "To Adjust Carburetor" in
Service and Adjustments section.
Contact a Sears or other qualified
service center.
Replace blade° Tighten blade bolt
Contact a Sears or other qualified
service center.
Tighten loose part(s).
Replace damaged parts.
Check wiring, switches and
connections. If not corrected,
contact a Sears or other
Replace blade., Tighten blade bolt
Level mower deck.
Clean underside of mower
housing.
Contact a Sears or other
qualified service center,
Clean around mandrels to
open vent holes.
Remove obstruction.
Replace mower drive belto
Replace idler pulley.
Contact a Sears or other
qualified service center.